His family fled the US to a country where polygamy was also illegal, but they thought they could get away with it better down there.
Funny how that came out as heroic in their version. My great grandfather also went to prison for polygamy, but the family stories are more about how he never supported his 4 wives and so it didn't make much difference. He was always on missions when he wasn't in jail.
My great grandfather was also a polygamist who didn't take care of his family (35 children and three wives!). TBMs in my family think he was a great patriarch (he died broke and landless). His family suffered right down to my generation with ignorance and poverty and Mormonism (the LDS hat trick). I have no regard for him.